function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blackburn, T.', 1],
    ['Coutanceau, Jean-Pierre', 2],
    ['Czerwiński, Tomasz & Szawaryn, Karol & Tomaszewska, Wioletta', 3],
    ['Gonzalez, Guillermo & Cotoras, Darko D. & Grez, Audrey A.', 3],
    ['Najajrah, Mohammad H. & Swaileh, Khalid M. & Qumsiyeh, Mazin B.', 1],
    ['Nattier, Romain & Jourdan, Hervé & Mille, Christian', 6],
    ['Romanowski, Jerzy & Ceryngier, Piotr & Větrovec, Jaroslav', 1],
    ['SZAWARYN, Karol & CERYNGIER, Piotr & ROMANOWSKI, Jerzy', 1],
    ['Weise, Julius', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);