function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 6],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 9],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 1],
    ['Ferrer-Gallego, P. Pablo & Martínez Labarga, Juan M.', 2],
    ['González-Velasco, Juan & Burgos-Hernández, Mireya', 29],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 11],
    ['Info Flora', 12],
    ['Jarvis, Charlie', 24],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 7],
    ['Linnaeus, Carolus', 20],
    ['Molino, Jean-François & Sabatier, Daniel & Grenand, Pierre', 2],
    ['Monteiro, Francisca & Costa, Esperança Da & Kissanga, Raquel', 2],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 10],
    ['Xie, Da-Jun & Li, Jin-Xiao & Peng, Shu-Ming & Deng, Tan', 2],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 2],
    ['Other (6)', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=145)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);