function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 7],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 2],
    ['Cho, Yanghoon & Kim, Jonghwan & Han, Jeong Eun & Lee, Byoungyoon', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 13],
    ['Info Flora', 9],
    ['Jarvis, Charlie', 5],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 9],
    ['Linnaeus, Carolus', 12],
    ['Paszko, Beata', 3],
    ['Prunera-Olivé, Joan & Vorontsova, Maria S. & Williams, Emma V.', 8],
    ['Sylvester, Steven P. & Cuta-Alarcon, Lia E.', 15],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 6],
    ['Vigosa-Mercado, J. Luis & Delgado-Salinas, Alfonso', 21],
    ['Williams, Emma Victoria & Elia Ntandu, John & Ficinski, Pawel', 4],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 9],
    ['Other (7)', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=135)',
    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);