function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dai, Xiao-Song & Min, Dao-Zhang & Yang, Bo & Wu, Ding & Li, Bo', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 1],
    ['Linnaeus, Carolus', 1],
    ['Ma, Yonghong & Zhou, Hanlu & Shu, Yumin', 1],
    ['Pham, Ngoc Hoai & Ren, Ming-Xun & Nuraliev, Maxim S.', 4],
    ['Shu, Yumin & Zhang, Zhixiang', 3],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Yu, Huiying & Guo, Feiyi & Shu, Yumin & Zhang, Zhixiang', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);