function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ashmead, William Harris', 2],
    ['Baur, Hannes', 4],
    ['Dale-Skey, Natalie & Askew, Richard R. & Noyes, John S.', 16],
    ['Madl, Michael', 1],
    ['Martínez-Chávez, Laura Marcela & Duque-Gamboa, Diana Nataly', 1],
    ['Montes-Rodríguez, José Mauricio & Kondo, Takumasa', 1],
    ['Pérez-Benavides, A. Lucía & Hernández-Baz, Fernando', 1],
    ['Shojaey, M. & Khayrandish, M. & Madjdzadeh, S. M.', 1],
    ['Tselikh, E. V. & Lee, J. & Ku, D-S.', 2],
    ['Walker, Francis', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);