function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 34],
    ['Bobrov, Alexander A. & Zalewska-Gałosz, Joanna', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 20],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 4],
    ['Info Flora', 25],
    ['Ito, Yu & Barfod, Anders S.', 14],
    ['Ito, Yu & Tanaka, Nobuyuki', 2],
    ['Ito, Yu & Tanaka, Norio & Pooma, Rachun & Tanaka, Nobuyuki', 2],
    ['Jarvis, Charlie', 12],
    ['Jeanmonod, Daniel', 1],
    ['Kapitonova, Olga A.', 10],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 23],
    ['Linnaeus, Carolus', 12],
    ['Wiegleb, G.', 2],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 2],
    ['Other (6)', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=170)',
    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);